- ATmega328 (not 328P) without bootloader
- Arduino Uno
- Arduino Leonardo (as ISP)
Wiring
Use jumper wires to connect two boards.
| Leonardo | - | Uno |
|---|---|---|
| 10 | - | Reset |
| 11 | - | 11 |
| 12 | - | 12 |
| 13 | - | 13 |
Use Arduino as ISP
I used Arduino IDE 1.6.8 on a Linux box. It is the latest version (Mar/2016).- Open a sketch
File menu -> Examples -> 11.ArduinoISP -> ArduinoISP - Select a board
Tools menu -> Board -> Arduino Leonardo - Select a port
Tools menu -> Port -> /dev/ttyACM0 (Arduino Leonardo)
Because I did not use ISP connector (2x3 pins), I uncommented the following line (line 81) in the source code.
#define USE_OLD_STYLE_WIRING
Burn the bootloader
I had to edit boards.txt (arduino-1.6.8/hardware/arduino/avr/boards.txt) to burn the bootloader and to build/upload a sketch later. I modified "Arduino/Genuino Uno" entry to support both 328P and 328.- Comment out the line.
# uno.build.mcu=atmega328p - Add the following lines.
uno.menu.cpu.atmega328p=ATmega328P
uno.menu.cpu.atmega328p.build.mcu=atmega328p
uno.menu.cpu.atmega328=ATmega328
uno.menu.cpu.atmega328.build.mcu=atmega328
- Select a board
Tools -> Board -> Arduino/Genuino Uno - Select a processor
Tools -> Processor -> ATmega328 - Select a port
Tools -> /dev/ttyACM0 (Arduino Leonardo) - Select a programmer
Tools -> Programmer -> "Arduino as ISP" - Burn
Tools -> Burn Bootloader
Upload a sketch
avrdude: Device signature = 0x1e950f
avrdude: Expected signature for ATmega328 is 1E 95 14
Double check chip, or use -F to override this check.
It said device signature was wrong. 0x1e950f is 328P's device signature and as message said 0x1e9514 is 328's device signature. I was confused but I just tried to build/upload with "ATmega328p", and it succeeded. A sample sketch worked okay too.
This is one thing I still cannot understand. Optiboot overwrites device signature? But anyway I can now upload a sketch to ATmega328 using Uno board and it is ready for a new project.
Appendix) Failed attempt
At first, I used a breadboard instead of Uno. And selected "Arduino Duemilanova or Diecimila" board when burning a bootloader. But it failed because of device signature mismatch.avrdude: Device signature = 0x1e9514
avrdude: Expected signature for ATmega328P is 1E 95 0F
Double check chip, or use -F to override this check.
In boards.txt, build.mcu is defined as below.
diecimila.menu.cpu.atmega328.build.mcu=atmega328p
I guessed it was the cause and removed 'p'.
diecimila.menu.cpu.atmega328.build.mcu=atmega328
Then it successfully burned and 13pin/led started blinking. I removed the ATmega328 from a breadboard, placed it on Uno board and uploaded a sketch. But I got the following error.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00
I checked boards.txt again and I thought it was because Uno's build.mcu was ATmega328P. And so removed 'p' again.
#uno.build.mcu=atmega328p
uno.build.mcu.atmega328
But I still got the same error.
I was about to give up and I almost ordered new ATmega328P, but I found the way to burn ATmega328 using Uno board. I have to lean some more basics of a microcontroller, a bootloader and a board...
